FreeMarker is stable, mature, and very easy to use. As a result, people don't tend to have much to add in terms of blogs or tutorials. I've collected a few resources that should provide useful.
http://sourceforge.net/projects/freemarker/forums/forum/2346/topic/4653490
You can use this to explore the XML functionality and also as an easy way to test template logic.
18.227.10.162